JP2010142867A - Coating agent composition for lost foam - Google Patents
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本発明は、耐火粒子を含有する消失模型用塗型剤組成物、及び消失模型鋳造法に関する。 The present invention relates to a vanishing model coating composition containing refractory particles and a vanishing model casting method.
砂型に使用される鋳造用塗型剤としては、溶融金属が接する砂型（鋳型）表面に塗布して塗型膜を塗装することにより、鋳型の表面を保護するものが知られている（特許文献１及び２等参照）。このような鋳造用塗型剤は、溶融金属と鋳型表面との化学反応や、鋳物の焼着欠陥の発生を防止するために用いられる。 As a casting coating agent used for sand molds, there is known one that protects the mold surface by applying a coating film on the sand mold (mold) surface that is in contact with the molten metal (Patent Document). See 1 and 2 etc.). Such a casting coating agent is used to prevent the chemical reaction between the molten metal and the mold surface and the occurrence of casting defects in the casting.
一方、消失模型に使用される鋳造用塗型剤は、消失模型の表面に塗布されるものであり、溶融金属と接触する前には、消失模型に由来する熱分解ガスを効率良く鋳型側に排出できるように気孔を有する塗型膜を形成し、溶融金属と接触する際には、溶融して上記気孔を塞ぎ、溶融金属と鋳型との接触を防ぐ機能が要求される。 On the other hand, the casting mold agent used for the disappearance model is applied to the surface of the disappearance model, and before contacting the molten metal, the pyrolysis gas derived from the disappearance model is efficiently transferred to the mold side. When a coating film having pores is formed so as to be discharged and contacted with the molten metal, a function of melting and closing the pores and preventing contact between the molten metal and the mold is required.
消失模型用塗型剤組成物として、特許文献３には、示差熱分析による吸熱ピーク温度が特定範囲内の鉱石を含有し、残渣欠陥、及び鋳物の溝部やコーナー部等に生じる焼着欠陥を同時に防止できる塗型剤組成物が開示されている。
しかし、従来の消失模型用塗型剤組成物では、消失模型の表面に塗布した後のタレ筋が鋳物の表面に転写することがあるということが本発明者の検討により判明した。従来の消失模型用塗型剤組成物は、タレ筋の転写防止について充分に検討されていなかった。 However, in the conventional vanishing model coating composition, the inventors have found that the sagging streaks after being applied to the surface of the disappearing model may be transferred to the surface of the casting. Conventional vanishing model coating agent compositions have not been sufficiently studied to prevent the transfer of sagging muscles.
本発明は、焼着欠陥及びタレ筋の転写を防止できる消失模型用塗型剤組成物、及び消失模型鋳造法を提供する。 The present invention provides a vanishing model coating composition capable of preventing seizure defects and sagging transfer, and a vanishing model casting method.
本発明の消失模型用塗型剤組成物は、耐火粒子を含有する消失模型用塗型剤組成物であって、該塗型剤組成物の灰分中において、ＳｉＯ２の含有量が８３．０〜９０．０重量％であり、Ａｌ２Ｏ３の含有量が６．２〜９．８重量％であり、Ｎａ２Ｏ及びＫ２Ｏの含有量の合計が２．２〜４．０重量％である、消失模型用塗型剤組成物である。 The vanishing model coating composition of the present invention is a vanishing model coating composition containing refractory particles, and the content of SiO 2 in the ash content of the coating composition is 83.0. ～90.0 weight%, and the content of Al 2 O 3 is 6.2 to 9.8 wt%, total 2.2 to 4.0 weight content of Na 2 O and K 2 O % Disappearance model coating composition.
本発明の消失模型鋳造法は、鋳物用消失模型を用いて鋳物を製造する消失模型鋳造法であって、前記鋳物用消失模型が、消失模型の表面に前記本発明の消失模型用塗型剤組成物を塗布してなる鋳物用消失模型であり、鋳込み温度が１３９０℃以上である、消失模型鋳造法である。 The vanishing model casting method of the present invention is a vanishing model casting method for producing a casting using the vanishing model for casting, wherein the vanishing model for casting is applied to the surface of the vanishing model on the surface of the vanishing model of the present invention. This is a vanishing model for castings formed by applying a composition, and is a vanishing model casting method in which the casting temperature is 1390 ° C. or higher.
本発明によれば、焼着欠陥及びタレ筋の転写が抑制された鋳物を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, the casting by which the transfer of the seizure defect and the sagging stripe was suppressed can be provided.
本発明の消失模型用塗型剤組成物（以下、単に「塗型剤組成物」ともいう）は、耐火粒子を含有し、該塗型剤組成物の灰分中において、ＳｉＯ２の含有量が８３．０〜９０．０重量％であり、Ａｌ２Ｏ３の含有量が６．２〜９．８重量％であり、Ｎａ２Ｏ及びＫ２Ｏの含有量の合計が２．２〜４．０重量％である。 The vanishing model coating composition of the present invention (hereinafter, also simply referred to as “coating composition”) contains refractory particles, and the ash content of the coating composition contains SiO 2. 83.0 to 90.0% by weight, the content of Al 2 O 3 is 6.2 to 9.8% by weight, and the total content of Na 2 O and K 2 O is 2.2 to 4 0.0% by weight.
本発明では、塗型剤組成物の灰分中において、ＳｉＯ２の含有量と、Ａｌ２Ｏ３の含有量と、Ｎａ２Ｏ及びＫ２Ｏの含有量の合計とを特定範囲とすることにより、溶融金属と接触する際に塗型膜の気孔を確実に塞ぐことができるため、焼着欠陥を防止できる。また、溶融金属と接触した後においても塗型膜の溶融による過剰な収縮を抑制できるため、タレ筋の転写を防止できる。 In the present invention, in the ash content of the coating composition, the SiO 2 content, the Al 2 O 3 content, and the total content of Na 2 O and K 2 O are within a specific range. Since the pores of the coating film can be reliably closed when coming into contact with the molten metal, it is possible to prevent seizure defects. Moreover, since excessive shrinkage due to melting of the coating film can be suppressed even after contact with the molten metal, transfer of the sagging streak can be prevented.
本発明の塗型剤組成物における灰分中の各成分の含有量は、以下の方法により測定される。即ち、塗型剤組成物を１０５０℃で１時間処理し、灼熱減量分を焙焼したのち、残った灰分１重量部に対し、四ホウ酸ナトリウムを１０重量部の割合で混合し、１２００℃で融解したのち、蛍光Ｘ線分析装置（リガク社製ＲＩＸ３１００）を用い測定する。 The content of each component in the ash content in the coating composition of the present invention is measured by the following method. That is, after the coating composition was treated at 1050 ° C. for 1 hour and the ignition loss was roasted, sodium tetraborate was mixed at a ratio of 10 parts by weight with respect to 1 part by weight of the remaining ash, and 1200 ° C. After melting, the measurement is performed using a fluorescent X-ray analyzer (RIX3100, manufactured by Rigaku Corporation).
本発明の塗型剤組成物における灰分の由来となる成分としては、耐火粒子、ベントナイトなどの焼結剤などが挙げられる。 Examples of components that are derived from ash in the coating composition of the present invention include refractory particles and sintering agents such as bentonite.
本発明の塗型剤組成物における灰分中のＳｉＯ２の含有量は、８３．０〜９０．０重量％である。タレ筋の転写防止の観点からは、８４．３重量％以上が好ましく、８５．５重量％以上がより好ましい。また、焼着欠陥防止の観点からは、８９．０重量％以下が好ましく、８７．５重量％以下がより好ましい。以上の観点から、灰分中のＳｉＯ２の含有量は、好ましくは８４．３〜８９．０重量％、より好ましくは８５．５〜８７．５重量％である。 The content of SiO 2 in the ash content in the coating composition of the present invention is 83.0 to 90.0% by weight. From the viewpoint of preventing transfer of the sagging muscle, it is preferably 84.3% by weight or more, and more preferably 85.5% by weight or more. Further, from the viewpoint of preventing seizure defects, 89.0% by weight or less is preferable, and 87.5% by weight or less is more preferable. From the above viewpoint, the content of SiO 2 in the ash is preferably 84.3 to 89.0% by weight, more preferably 85.5 to 87.5% by weight.
本発明の塗型剤組成物における灰分中のＡｌ２Ｏ３の含有量は、６．２〜９．８重量％である。焼着欠陥防止の観点からは、６．３重量％以上が好ましく、７．０重量％以上がより好ましい。また、タレ筋の転写防止の観点からは、９．２重量％以下が好ましく、８．４重量％以下がより好ましい。以上の観点から、灰分中のＡｌ２Ｏ３の含有量は、好ましくは６．３〜９．２重量％、より好ましくは７．０〜８．４重量％である。 The content of Al 2 O 3 in the ash content in the coating composition of the present invention is 6.2 to 9.8% by weight. From the viewpoint of preventing seizure defects, it is preferably 6.3% by weight or more, and more preferably 7.0% by weight or more. Further, from the viewpoint of preventing the transfer of the sagging muscle, 9.2% by weight or less is preferable, and 8.4% by weight or less is more preferable. From the above viewpoint, the content of Al 2 O 3 in the ash is preferably 6.3 to 9.2% by weight, more preferably 7.0 to 8.4% by weight.
本発明の塗型剤組成物における灰分中のＮａ2Ｏ及びＫ2Ｏの含有量の合計は、２．２〜４．０重量％である。焼着欠陥をより確実に防止する観点からは、２．３重量％以上が好ましい。また、タレ筋の転写をより確実に防止する観点からは、３．２重量％以下が好ましく、３．０重量％以下がより好ましい。以上の観点から、好ましくは２．３〜３．２重量％、より好ましくは２．３〜３．０重量％である。なお、Ｎａ2Ｏ及びＫ2Ｏの含有量の合計とは、Ｎａ2Ｏ単独又はＫ2Ｏ単独の場合であってもよく、Ｎａ2ＯとＫ2Ｏとを共に含有している場合であってもよい。Ｎａ2ＯとＫ2Ｏとを共に含有する場合は、Ｎａ2Ｏ／Ｋ2Ｏ（重量比）は、１／３〜３／１が好ましく、１／２〜２／１がより好ましい。 The total content of Na 2 O and K 2 O in the ash in the coating composition of the present invention is 2.2 to 4.0% by weight. From the viewpoint of more reliably preventing seizure defects, 2.3% by weight or more is preferable. Further, from the viewpoint of more surely preventing the transfer of the sagging muscle, it is preferably 3.2% by weight or less, and more preferably 3.0% by weight or less. From the above viewpoint, it is preferably 2.3 to 3.2% by weight, more preferably 2.3 to 3.0% by weight. The total content of Na 2 O and K 2 O may be Na 2 O alone or K 2 O alone, or it may contain both Na 2 O and K 2 O. There may be. When both Na 2 O and K 2 O are contained, the Na 2 O / K 2 O (weight ratio) is preferably 1/3 to 3/1, and more preferably 1/2 to 2/1.
灰分中における各成分の含有量を上述した範囲とするには、後述する実施例に示すように、組成が既知の耐火粒子を組み合わせることで達成できる。例えば、黒曜石（ＳｉＯ２：７２．８％、Ａｌ２Ｏ３：１６．６％、Ｆｅ２Ｏ３：１．０％、ＣａＯ：０．６％、ＭｇＯ：０．１％、ＴｉＯ２：０．１％、Ｎａ２Ｏ：４．３％、Ｋ２Ｏ：４．３％、ＭｎＯ：０．１％）、真珠岩（ＳｉＯ２：７３．４％、Ａｌ２Ｏ３：１３．０％、Ｆｅ２Ｏ３：１．８％、Ｎａ２Ｏ：３．８％、Ｋ２Ｏ：３．９％）、松脂岩（ＳｉＯ２：７０．２％、Ａｌ２Ｏ３：１２．４％、Ｆｅ２Ｏ３：１．５％、Ｎａ２Ｏ：３．０％、Ｋ２Ｏ：３．６％）、正長石（ＳｉＯ2：６５．０％、Ａｌ2Ｏ3：１８．０％、Ｋ2Ｏ：１７．０％）、曹長石（ＳｉＯ2：６９．０％、Ａｌ2Ｏ3：１９．０％、Ｎａ2Ｏ：１２．０％）、白瑠石（ＳｉＯ2：５５．０％、Ａｌ2Ｏ3：２３．０％、Ｋ2Ｏ：２２．０％）、霞石（（Ｎａ，Ｋ）ＡｌＳｉＯ4）、シリカ（ＳｉＯ２：９２．８％、Ａｌ２Ｏ３：３．８％、Ｆｅ２Ｏ３：１．４％、ＣａＯ：０．２％、ＭｇＯ：０．６％、ＴｉＯ２：０．１％、Ｋ２Ｏ：０．３％）、アルミナ（Ａｌ2Ｏ3：１００％）、ムライト（ＳｉＯ2：２８．０％、Ａｌ2Ｏ3：７２．０％）、シャフトバンケツ５０％（ＳｉＯ2：３８．０％、Ａｌ2Ｏ3：５６．０％、Ｆｅ2Ｏ3：１．７％、ＴｉＯ2：２．６％）、シャフトバンケツ８５％（ＳｉＯ2：８．０％、Ａｌ2Ｏ3：８５．０％、Ｆｅ2Ｏ3：２．１％、ＴｉＯ2：３．３％）、ダイアスポア（Ａｌ2Ｏ3：８５．０％、Ｈ2Ｏ：１５．０％）、蝋石（ＳｉＯ2：６７．０％、Ａｌ2Ｏ3：２８．０％、Ｈ2Ｏ：５．０％）、スピネル（ＭｇＯ：２８．０％、Ａｌ2Ｏ3：７２．０％）、カオリン（ＳｉＯ2：４６．０％、Ａｌ2Ｏ3：４０．０％、Ｈ2Ｏ：１４．０％）、シリマナイト（ＳｉＯ2：３７．０％、Ａｌ2Ｏ3：６３．０％）、アンダルサイト（ＳｉＯ2：３７．０％、Ａｌ2Ｏ3：６３．０％）、カイヤナイト（ＳｉＯ2：３７．０％、Ａｌ2Ｏ3：６３．０％）、ギブサイト（ＳｉＯ2：３５．０％、Ａｌ2Ｏ3：６５．０％）、黒砂石（ＳｉＯ2：４６．０％、Ａｌ2Ｏ3：３８．０％、Ｆｅ2Ｏ3：０．３％、ＴｉＯ２：０．４％、ＣａＯ：０．３％、ＭｇＯ：０．１％）、デッカイト（ＳｉＯ2：４３．０〜４７．０％、Ａｌ2Ｏ3：３９．０〜４１．０％）、灰長石（ＳｉＯ2：４３．０％、Ａｌ2Ｏ3：３７．０％、ＣａＯ：２０．０％）、ボーキサイトを焼成したもの等を適宜配合することが好ましい。なお、これらの％はいずれも重量％である。 The content of each component in the ash can be set to the above-described range by combining refractory particles having a known composition, as shown in Examples described later. For example, obsidian (SiO 2 : 72.8%, Al 2 O 3 : 16.6%, Fe 2 O 3 : 1.0%, CaO: 0.6%, MgO: 0.1%, TiO 2 : 0 0.1%, Na 2 O: 4.3%, K 2 O: 4.3%, MnO: 0.1%, nacre (SiO 2 : 73.4%, Al 2 O 3 : 13.0% , Fe 2 O 3 : 1.8%, Na 2 O: 3.8%, K 2 O: 3.9%), pine sebite (SiO 2 : 70.2%, Al 2 O 3 : 12.4% , Fe 2 O 3: 1.5% , Na 2 O: 3.0%, K 2 O: 3.6%), orthoclase (SiO 2: 65.0%, Al 2 O 3: 18.0% , K 2 O: 17.0%), feldspar (SiO 2 : 69.0%, Al 2 O 3 : 19.0%, Na 2 O: 12.0%), leucite (SiO 2 : 55) .0%, Al 2 O 3: 23.0% K 2 O: 22.0%), nepheline ((Na, K) AlSiO 4 ), silica (SiO 2: 92.8%, Al 2 O 3: 3.8%, Fe 2 O 3: 1.4 %, CaO: 0.2%, MgO : 0.6%, TiO 2: 0.1%, K 2 O: 0.3%), alumina (Al 2 O 3: 100% ), mullite (SiO 2: 28.0%, Al 2 O 3: 72.0%), the shaft vans ass 50% (SiO 2: 38.0% , Al 2 O 3: 56.0%, Fe 2 O 3: 1.7%, TiO 2 : 2.6%), shaft bank 85% (SiO 2 : 8.0%, Al 2 O 3 : 85.0%, Fe 2 O 3 : 2.1%, TiO 2 : 3.3% ), Diaspore (Al 2 O 3 : 85.0%, H 2 O: 15.0%), wax (SiO 2 : 67.0%, Al 2 O 3 : 28.0%, H 2 O: 5. 0%), Pinel (MgO: 28.0%, Al 2 O 3: 72.0%), kaolin (SiO 2: 46.0%, Al 2 O 3: 40.0%, H 2 O: 14.0%), Silimanite (SiO 2 : 37.0%, Al 2 O 3 : 63.0%), Andalsite (SiO 2 : 37.0%, Al 2 O 3 : 63.0%), Kyanite (SiO 2 : 37 .0%, Al 2 O 3: 63.0%), gibbsite (SiO 2: 35.0%, Al 2 O 3: 65.0%), black sand stone (SiO 2: 46.0%, Al 2 O 3: 38.0%, Fe 2 O 3: 0.3%, TiO 2: 0.4%, CaO: 0.3%, MgO: 0.1%), Dekkaito (SiO 2: 43.0 to 47 0.0%, Al 2 O 3 : 39.0 to 41.0%), anorthite (SiO 2 : 43.0%, Al 2 O 3 : 37.0%, CaO: 20.0) %), Those obtained by baking bauxite, and the like are preferably blended as appropriate. These percentages are all by weight.
上記の組成比率を容易に達成するには、塗型剤組成物中の耐火粒子が、耐火粒子ａ及び耐火粒子ｂを含み、該耐火粒子ａがシリカであり、該耐火粒子ｂが、黒曜石、真珠岩及び松脂岩から選ばれる１種以上であることが好ましい。中でも、前記耐火粒子ｂとして黒曜石を含むことがより好ましい。また、黒曜石を含む場合は、耐火粒子全体における黒曜石の含有量が、１８．０〜３５．０重量％であることが好ましく、１８．０〜２４．０重量％であることがより好ましく、１９．０〜２２．０重量％が更に好ましい。 In order to easily achieve the above composition ratio, the refractory particles in the coating composition include refractory particles a and refractory particles b, the refractory particles a are silica, and the refractory particles b are obsidian, It is preferable that it is 1 or more types chosen from a pearlite and a rosinite. Among these, it is more preferable that obsidian is included as the refractory particles b. When obsidian is included, the content of obsidian in the entire refractory particles is preferably 18.0 to 35.0% by weight, more preferably 18.0 to 24.0% by weight, More preferably, the content is 0.0 to 22.0% by weight.
また、焼着欠陥及びタレ筋の転写をより効果的に抑制するには、塗型剤組成物の灰分中において、ＳｉＯ２の含有量をＡｌ２Ｏ３の含有量で割った値が８．５〜１３．５であることが好ましく、８．５〜１２．５であることがより好ましく、更に８．５〜１１．０であることが好ましく、より更に１０．０〜１１．０であることが好ましい。ＳｉＯ２とＡｌ２Ｏ３との含有量比を上記範囲内に制御するには、耐火粒子中において前記耐火粒子ａの含有量を前記耐火粒子ｂの含有量で割った値が、１．５〜３．９となるように配合することが好ましく、１．６〜３．０となるように配合することがより好ましい。 In order to more effectively suppress the transfer of seizure defects and sagging streaks, the value obtained by dividing the content of SiO 2 by the content of Al 2 O 3 in the ash content of the coating composition is 8. 5 to 13.5 is preferable, 8.5 to 12.5 is more preferable, 8.5 to 11.0 is further preferable, and 10.0 to 11.0 is even more preferable. It is preferable. In order to control the content ratio of SiO 2 and Al 2 O 3 within the above range, a value obtained by dividing the content of the refractory particles a by the content of the refractory particles b in the refractory particles is 1.5. It is preferable to mix | blend so that it may become -3.9, and it is more preferable to mix | blend so that it may become 1.6-3.0.
本発明では、更に、前記耐火粒子中に黒鉛を５．０〜３０．０重量％含むことが好ましい。溶融金属に対する塗型膜の濡れ性を低下させることにより、焼着欠陥をより確実に防止できるからである。上記効果をより有効に発揮させるには、前記耐火粒子中に黒鉛を１５．０〜２５．０重量％含むことがより好ましい。 In the present invention, it is preferable that the refractory particles further contain 5.0 to 30.0% by weight of graphite. This is because, by reducing the wettability of the coating film with respect to the molten metal, it is possible to more reliably prevent the deposition defect. In order to exhibit the above effect more effectively, the refractory particles preferably contain 15.0 to 25.0% by weight of graphite.
本発明に用いられる耐火粒子の平均粒径は、６０〜２００μｍであることが好ましい。耐火粒子の平均粒径が上記範囲内であれば、溶融金属と接触する前において、消失模型に由来する熱分解ガスを効率良く鋳型側に排出できる大きさの気孔を形成することができる。これにより、残渣欠陥を防止できる。また、溶融金属と接触する際において、塗型膜の気孔をより確実に塞ぐことができるため、焼着欠陥をより確実に防止できる。残渣欠陥を防止する観点からは、耐火粒子の平均粒径は、７０μｍ以上であることがより好ましく、８０μｍ以上であることが更に好ましい。また、焼着欠陥を防止する観点からは、耐火粒子の平均粒径は、１８０μｍ以下であることがより好ましく、１６０μｍ以下であることが更に好ましい。以上の観点から、耐火粒子の平均粒径は、７０〜１８０μｍであることがより好ましく、８０〜１６０μｍであることが更に好ましい。なお、本発明において、耐火粒子の平均粒径は、レーザー回折／散乱式粒度分布測定装置（堀場製作所製 ＬＡ−９２０型）にて測定した粒子の粒度分布のメジアン径である。 The average particle diameter of the refractory particles used in the present invention is preferably 60 to 200 μm. If the average particle diameter of the refractory particles is within the above range, it is possible to form pores having such a size that the pyrolysis gas derived from the disappearance model can be efficiently discharged to the mold side before coming into contact with the molten metal. Thereby, a residue defect can be prevented. Further, when contacting with the molten metal, the pores of the coating film can be more reliably blocked, so that it is possible to more reliably prevent the deposition defect. From the viewpoint of preventing residual defects, the average particle size of the refractory particles is more preferably 70 μm or more, and further preferably 80 μm or more. Further, from the viewpoint of preventing seizure defects, the average particle size of the refractory particles is more preferably 180 μm or less, and even more preferably 160 μm or less. From the above viewpoint, the average particle diameter of the refractory particles is more preferably 70 to 180 μm, and further preferably 80 to 160 μm. In the present invention, the average particle diameter of the refractory particles is the median diameter of the particle size distribution of the particles measured with a laser diffraction / scattering particle size distribution measuring device (LA-920 type, manufactured by Horiba, Ltd.).
本発明の塗型剤組成物中の耐火粒子の含有量は、本発明の目的を達成する観点から、好ましくは２０．０〜７０．０重量％であり、より好ましくは２０．０〜６０．０重量％である。 From the viewpoint of achieving the object of the present invention, the content of the refractory particles in the coating composition of the present invention is preferably 20.0 to 70.0% by weight, more preferably 20.0 to 60.%. 0% by weight.
本発明の塗型剤組成物に用いる分散媒は、アルコール類や水等が使用できる。アルコール系塗型剤組成物の場合は、メタノール、エタノール、イソプロピルアルコール等の低級アルコール類が好ましく、メタノールがより好ましい。この場合、芳香族溶剤や炭化水素系溶剤を補助溶剤として使用してもよい。水系塗型剤組成物の場合は水が主分散媒となる。分散媒の添加量は、低級アルコールであれば耐火粒子の合計１００重量部に対し、２０〜１２０重量部が好ましく、７０〜１１０重量部がより好ましい。また、水系塗型剤組成物の場合、水の添加量は、耐火粒子の合計１００重量部に対し、２０〜１５０重量部が好ましく、７０〜１３０重量部がより好ましい。 Alcohols, water, etc. can be used for the dispersion medium used for the coating composition of the present invention. In the case of an alcoholic coating composition, lower alcohols such as methanol, ethanol and isopropyl alcohol are preferred, and methanol is more preferred. In this case, an aromatic solvent or a hydrocarbon solvent may be used as an auxiliary solvent. In the case of an aqueous coating composition, water is the main dispersion medium. The amount of the dispersion medium added is preferably 20 to 120 parts by weight, more preferably 70 to 110 parts by weight, based on 100 parts by weight of the total refractory particles if it is a lower alcohol. In the case of an aqueous coating composition, the amount of water added is preferably 20 to 150 parts by weight, more preferably 70 to 130 parts by weight, based on 100 parts by weight of the total refractory particles.
また、本発明の塗型剤組成物には、通常使用されるような粘結剤を配合できる。例えば、水系ではポリアクリル酸ナトリウム、澱粉、メチルセルロース、ポリビニルアルコール、アルギン酸ナトリウム、アラビアガム等の水溶性高分子や各種の樹脂エマルションが使用できる。また、アルコール系ではアルコールに可溶又は分散する各種樹脂を添加するのが、塗型膜強度の点から好ましい。粘結剤の添加量は、耐火粒子の合計１００重量部に対し、好ましくは０．５〜３０重量部である。 In addition, a binder as commonly used can be blended in the coating composition of the present invention. For example, water-soluble polymers such as sodium polyacrylate, starch, methylcellulose, polyvinyl alcohol, sodium alginate, and gum arabic and various resin emulsions can be used in the aqueous system. In addition, in the case of an alcohol type, it is preferable from the viewpoint of coating film strength to add various resins that are soluble or dispersed in alcohol. The addition amount of the binder is preferably 0.5 to 30 parts by weight with respect to 100 parts by weight of the total refractory particles.
また、本発明の塗型剤組成物には、通常使用されるような焼結剤を配合できる。例えば、ナトリウムベントナイト、カルシウムベントナイト等のベントナイト、木節粘土等の粘土類、エチルシリケート等が挙げられる。中でも、ベントナイトは、焼結剤としての役割の他、高温域においては粘結剤としての役割も果たすため好ましい。焼結剤の添加量は、耐火粒子の合計１００重量部に対し、３〜１０重量部が好ましい。 Moreover, the sintering agent which is normally used can be mix | blended with the coating agent composition of this invention. Examples thereof include bentonites such as sodium bentonite and calcium bentonite, clays such as kibushi clay, and ethyl silicate. Among them, bentonite is preferable because it plays a role as a binder in a high temperature range in addition to a role as a sintering agent. The addition amount of the sintering agent is preferably 3 to 10 parts by weight with respect to 100 parts by weight of the total refractory particles.
その他に、本発明の塗型剤組成物に配合できる成分として、界面活性剤、分散剤、チキソトロピー性付与剤等が挙げられる。 In addition, surfactants, dispersants, thixotropic agents, and the like are listed as components that can be blended in the coating composition of the present invention.
本発明の塗型剤組成物は、消失模型の表面に塗布される塗型剤組成物として好適に使用することができる。従って、本発明は、消失模型の表面に上述した本発明の塗型剤組成物を塗布してなる鋳物用消失模型を提供することができる。 The coating composition of the present invention can be suitably used as a coating composition that is applied to the surface of the disappearance model. Therefore, this invention can provide the vanishing model for casting formed by apply | coating the coating agent composition of this invention mentioned above to the surface of the vanishing model.
塗型剤組成物が塗布される消失模型としては、通常と同様の合成樹脂発泡体の模型を用いることができる。合成樹脂発泡体としては、ポリスチレン、ポリメタクリル酸メチル、又はこれらの共重合体等の発泡体が用いられる。塗型剤組成物を消失模型に塗布する方法は、流し塗り（ブッカケ法）、浸漬（ドブ漬け法）、刷毛塗り、スプレー塗布等の従来知られている方法の何れでも良い。 As the disappearance model to which the coating agent composition is applied, the same model of a synthetic resin foam as usual can be used. As the synthetic resin foam, a foam such as polystyrene, polymethyl methacrylate, or a copolymer thereof is used. The method for applying the coating composition to the disappearing model may be any of conventionally known methods such as flow coating (bukkake method), dipping (dipping method), brush coating, spray coating, and the like.
次に、本発明の消失模型鋳造法について説明する。本発明の消失模型鋳造法は、上記本発明の塗型剤組成物が塗布された鋳物用消失模型を用いて鋳物を製造する消失模型鋳造法である。鋳造に用いる鋳物砂としては、石英質を主成分とする珪砂の他、ジルコン砂、クロマイト砂、合成セラミック砂等の新砂又は再生砂が使用される。鋳物砂は粘結剤を添加せずに用いることもでき、その場合には充填性が良好であるが、高強度の鋳型が要求される場合には、粘結剤を添加し、硬化剤により硬化させるのが好ましい。 Next, the disappearance model casting method of the present invention will be described. The vanishing model casting method of the present invention is a vanishing model casting method in which a casting is manufactured using the vanishing model for casting coated with the above-described coating agent composition of the present invention. As foundry sand used for casting, new sand or recycled sand such as zircon sand, chromite sand, and synthetic ceramic sand is used in addition to quartz sand mainly composed of quartz. Casting sand can also be used without adding a binder, in which case the filling property is good, but when a high-strength mold is required, a binder is added and a hardener is used. It is preferable to cure.
本発明の消失模型鋳造法は、通常の方法に準じて行うことができる。通常の鋳込み温度は、使用する金属により異なるが、鋳鉄系の場合は一般に１３３０〜１４１０℃であり、アルミニウム系の場合は一般に７００〜７５０℃であり、鋳鋼系の場合は一般に１４５０〜１５００℃である。鋳込み温度は、ニッサブ社製浸漬温度計ＮＳＰ−１２０８Ｒに測定用チップＮ−ＤＩＰ−Ｒを用いて測定し、測定後１０秒以内に注湯を開始する。中でも、鋳込み温度が１３９０℃以上の場合は、従来の方法では焼着欠陥やタレ筋の転写が発生しやすいので、本発明の効果を有効に利用するために、本発明の消失模型鋳造法では、鋳込み温度を１３９０℃以上とする。このような鋳込み温度に対して、本発明の塗型剤組成物による塗型膜が形成された鋳物用消失模型を用いて、鋳込みが行われる。また、熱分解ガスの排気効率を高めるために減圧下鋳造を行ったり、大気に連通する排気管を設けたりしてもよい。 The disappearance model casting method of the present invention can be carried out according to a usual method. The normal casting temperature varies depending on the metal to be used, but is generally 1330 to 1410 ° C. in the case of cast iron, generally 700 to 750 ° C. in the case of aluminum, and generally 1450 to 1500 ° C. in the case of cast steel. is there. The casting temperature is measured using a measuring tip N-DIP-R on an immersion thermometer NSP-1208R manufactured by Nissab Corporation, and pouring is started within 10 seconds after the measurement. In particular, when the casting temperature is 1390 ° C. or higher, the conventional method tends to cause transfer of seizure defects and sagging streaks. Therefore, in order to effectively use the effects of the present invention, The casting temperature is 1390 ° C. or higher. For such casting temperature, casting is performed using a casting disappearance model in which a coating film is formed by the coating composition of the present invention. Further, in order to increase the exhaust efficiency of the pyrolysis gas, casting under reduced pressure may be performed, or an exhaust pipe communicating with the atmosphere may be provided.
以下、本発明を具体的に示す実施例等について説明する。 Examples and the like specifically showing the present invention will be described below.
（実施例１）
＜塗型剤組成物の調製＞
表１に示す組成の耐火粒子５２．０重量％と、ノニオン性界面活性剤（花王製、エマルゲン１０６）３．０重量％と、ベントナイト２．５重量％と、ポリビニルアルコール２．０重量％と、イオン交換水２５．０重量％とを配合した。これらをミキサー（カントーミキサー社製、ＫＴＭ−１０）により、２速（２５０ｒｐｍ）の条件下で１０分間混練し、ペースト状の組成物を得た後、更にイオン交換水１５．５重量％を添加し、混合してスラリー状の実施例１の塗型剤組成物を調製した。使用した各材料中の成分含有量は下記のとおりである。なお、以下の％はいずれも重量％である。
Example 1
<Preparation of coating agent composition>
52.0% by weight of refractory particles having the composition shown in Table 1, 3.0% by weight of a nonionic surfactant (manufactured by Kao, Emulgen 106), 2.5% by weight of bentonite, and 2.0% by weight of polyvinyl alcohol And 25.0% by weight of ion-exchanged water were blended. These were kneaded with a mixer (KTM-10, manufactured by Can Tho Mixer) for 10 minutes under the condition of 2nd speed (250 rpm) to obtain a paste-like composition, and then 15.5% by weight of ion-exchanged water was further added. Then, a slurry-like coating composition of Example 1 was prepared by mixing. The component content in each material used is as follows. In addition, all of the following% are weight%.
（黒曜石）「揮発分：１．０％、ＳｉＯ２：７２．８％、Ａｌ２Ｏ３：１６．６％、Ｆｅ２Ｏ３：１．０％、ＣａＯ：０．６％、ＭｇＯ：０．１％、ＴｉＯ２：０．１％、Ｎａ２Ｏ：４．３％、Ｋ２Ｏ：４．３％、ＭｎＯ：０．１％」
（真珠岩）「揮発分：３．７％、ＳｉＯ２：７３．４％、Ａｌ２Ｏ３：１３．０％、Ｆｅ２Ｏ３：１．８％、Ｎａ２Ｏ：３．８％、Ｋ２Ｏ：３．９％」
（松脂岩）「揮発分：６．５％、ＳｉＯ２：７０．２％、Ａｌ２Ｏ３：１２．４％、Ｆｅ２Ｏ３：１．５％、Ｎａ２Ｏ：３．０％、Ｋ２Ｏ：３．６％」
（シリカ）「ＳｉＯ２：９２．８％、Ａｌ２Ｏ３：３．８％、Ｆｅ２Ｏ３：１．４％、ＣａＯ：０．２％、ＭｇＯ：０．６％、ＴｉＯ２：０．１％、Ｋ２Ｏ：０．３％」
（黒鉛）「揮発分：２．０％、固定炭素：８５．４％、ＳｉＯ２：７．５％、Ａｌ２Ｏ３：３．４％、Ｆｅ２Ｏ３：０．９％、ＣａＯ：０．２％、ＭｇＯ：０．２％、Ｋ２Ｏ：０．３％」
（ベントナイト）「ＳｉＯ２：６８．９％、Ａｌ２Ｏ３：１６．９％、Ｆｅ２Ｏ３：２．４％、ＣａＯ：４．３％、ＭｇＯ：２．６％、ＴｉＯ２：０．３％、Ｎａ２Ｏ：３．０％、Ｋ２Ｏ：１．４％、ＭｎＯ：０．１％、Ｐ２Ｏ５：０．１％」
(Obsidian) “Volatile content: 1.0%, SiO 2 : 72.8%, Al 2 O 3 : 16.6%, Fe 2 O 3 : 1.0%, CaO: 0.6%, MgO: 0 0.1%, TiO 2 : 0.1%, Na 2 O: 4.3%, K 2 O: 4.3%, MnO: 0.1% ”
(Pearlite) “Volatile matter: 3.7%, SiO 2 : 73.4%, Al 2 O 3 : 13.0%, Fe 2 O 3 : 1.8%, Na 2 O: 3.8%, K 2 O: 3.9% ”
(Pinestone) “Volatile content: 6.5%, SiO 2 : 70.2%, Al 2 O 3 : 12.4%, Fe 2 O 3 : 1.5%, Na 2 O: 3.0%, K 2 O: 3.6% ”
(Silica) “SiO 2 : 92.8%, Al 2 O 3 : 3.8%, Fe 2 O 3 : 1.4%, CaO: 0.2%, MgO: 0.6%, TiO 2 : 0 .1%, K 2 O: 0.3% ”
(Graphite) “Volatile content: 2.0%, Fixed carbon: 85.4%, SiO 2 : 7.5%, Al 2 O 3 : 3.4%, Fe 2 O 3 : 0.9%, CaO: 0.2%, MgO: 0.2%, K 2 O: 0.3% . "
(Bentonite) “SiO 2 : 68.9%, Al 2 O 3 : 16.9%, Fe 2 O 3 : 2.4%, CaO: 4.3%, MgO: 2.6%, TiO 2 : 0 .3%, Na 2 O: 3.0%, K 2 O: 1.4%, MnO: 0.1%, P 2 O 5 : 0.1% ”
＜焼着欠陥の評価＞
発泡ポリスチレン（発泡倍率５０倍）を用いて図１に示す形状の消失模型を作製した。この消失模型の表面に上記塗型剤組成物を塗布し（乾燥膜厚：１ｍｍ）、鋳物用消失模型を作製した。そして、フリーマントル珪砂（５号）１００重量部に有機スルホン酸硬化剤（花王クエーカー製、ＴＫ−２）を０．２重量部添加し、これらを混練した後に、フラン樹脂（花王クエーカー製、３４０Ｂ）を上記珪砂１００重量部に対して０．５重量部混合した。得られた混練砂に上記の鋳物用消失模型を埋設し、溶融金属が溢れない速度で堰から鋳込みを行い（鋳鉄：ＦＣ−２５０、鋳込み温度：１４００℃）、２４時間経過後、鋳型をばらして鋳物を取り出した。得られた鋳物について、焼着欠陥の有無を下記基準により目視で評価した。結果を表１に示す。なお、表１に示す組成の耐火粒子の平均粒径は、レーザー回折／散乱式粒度分布測定装置（堀場製作所製 ＬＡ−９２０型）を用い、相対屈折率を１．０９として測定した。
<Evaluation of seizure defects>
The disappearance model of the shape shown in FIG. 1 was produced using expanded polystyrene (expanding ratio 50 times). The said mold agent composition was apply | coated to the surface of this vanishing model (dry film thickness: 1 mm), and the vanishing model for casting was produced. Then, 0.2 part by weight of an organic sulfonic acid curing agent (manufactured by Kao Quaker, TK-2) is added to 100 parts by weight of Fremantle quartz sand (No. 5), and after kneading these, furan resin (manufactured by Kao Quaker, 340B) ) Was mixed at 0.5 parts by weight with respect to 100 parts by weight of the above silica sand. The above-mentioned disappearance model for casting is embedded in the obtained kneaded sand and cast from the weir at a speed at which the molten metal does not overflow (cast iron: FC-250, casting temperature: 1400 ° C.). After 24 hours, the mold is separated. The casting was taken out. About the obtained casting, the presence or absence of the seizure defect was visually evaluated according to the following criteria. The results are shown in Table 1. In addition, the average particle diameter of the refractory particles having the composition shown in Table 1 was measured using a laser diffraction / scattering particle size distribution measuring apparatus (LA-920 type, manufactured by Horiba, Ltd.) with a relative refractive index of 1.09.
[焼着欠陥の評価基準]
ポケット部の焼着が全く無いものをＡ、コーナー部の焼着の幅が５ｍｍ以下でかつ底面部の焼着の厚さが１ｍｍ以下である場合をＢ、コーナー部の焼着の幅が５ｍｍ超又は底面部の焼着の厚さが１ｍｍ超である場合をＣとした。
[Evaluation criteria for seizure defects]
A when there is no pocket part baking, B when the corner baking width is 5 mm or less and the bottom part baking thickness is 1 mm or less B, corner part baking width is 5 mm The case where the thickness of the superposition or the thickness of the bottom portion was more than 1 mm was defined as C.
＜タレ筋の転写の評価＞
発泡ポリスチレン（発泡倍率５０倍）を用いて図１に示す形状の消失模型を作製した。この消失模型の表面に上記塗型剤組成物を塗布し（乾燥膜厚：１ｍｍ）、該塗膜の上に、更に、厚さ４ｍｍ、幅２０ｍｍ、長さ２１０ｍｍの上記塗型剤組成物からなる塗膜を形成し、鋳物用消失模型を作製した。そして、上記＜焼着欠陥の評価＞と同様の方法で鋳込みを行い（鋳鉄：ＦＣ−２５０、鋳込み温度：１４００℃）、２４時間経過後、鋳型をばらして鋳物を取り出し、６分間ショットブラストをかけたのち、タレ筋の転写の有無を下記基準により目視で評価した。結果を表１に示す。
<Evaluation of transcription of sagging muscle>
The disappearance model of the shape shown in FIG. 1 was produced using expanded polystyrene (expanding ratio 50 times). The coating composition is applied to the surface of the disappearance model (dry film thickness: 1 mm), and further on the coating film, from the coating composition having a thickness of 4 mm, a width of 20 mm, and a length of 210 mm. A coating film to be formed was formed, and a casting disappearance model was prepared. Then, casting is performed in the same manner as in the above <Evaluation of seizure defects> (cast iron: FC-250, casting temperature: 1400 ° C.). After 24 hours, the mold is released and the casting is taken out, and shot blasting is performed for 6 minutes. After applying, the presence or absence of transfer of the sagging muscle was visually evaluated according to the following criteria. The results are shown in Table 1.
[タレ筋の転写の評価基準]
鋳物表面が全く平らであるものをＡ、鋳物表面に凹凸はないが厚塗り部に対応する位置が検出できるものをＢ、鋳物表面に凹凸があるものをＣとした。
[Evaluation criteria for sagging muscle transcription]
The casting surface was completely flat A, the casting surface was not uneven, but the position corresponding to the thick-coated portion was detected B, and the casting surface was uneven C.
（実施例２〜４及び比較例１〜４）
実施例２〜４及び比較例１〜４として、耐火粒子を表１に示す組成に変更したこと以外は上記実施例１と同様に塗型剤組成物を調製して鋳物を製造し、上記実施例１と同様に評価した。これらの結果を表１に示す。
(Examples 2 to 4 and Comparative Examples 1 to 4)
As Examples 2 to 4 and Comparative Examples 1 to 4, except that the refractory particles were changed to the compositions shown in Table 1, a casting agent composition was prepared in the same manner as in Example 1 to produce a casting, and the above implementation was performed. Evaluation was performed in the same manner as in Example 1. These results are shown in Table 1.
表１の結果が示すように、実施例１〜４は、いずれも焼着欠陥及びタレ筋の転写を抑制できた。一方、比較例１〜４は、焼着欠陥及びタレ筋の転写の少なくとも一方について抑制することができなかった。 As the results of Table 1 show, all of Examples 1 to 4 were able to suppress the transfer of seizure defects and sagging muscles. On the other hand, in Comparative Examples 1 to 4, it was not possible to suppress at least one of seizure defects and sagging muscle transfer.
Claims (6)
該塗型剤組成物の灰分中において、ＳｉＯ２の含有量が８３．０〜９０．０重量％であり、Ａｌ２Ｏ３の含有量が６．２〜９．８重量％であり、Ｎａ２Ｏ及びＫ２Ｏの含有量の合計が２．２〜４．０重量％である、消失模型用塗型剤組成物。 A vanishing model coating composition containing refractory particles,
In the ash content of the coating composition, the content of SiO 2 is 83.0 to 90.0% by weight, the content of Al 2 O 3 is 6.2 to 9.8% by weight, Na The disappearance model coating composition, wherein the total content of 2 O and K 2 O is 2.2 to 4.0 wt%.
前記耐火粒子ａは、シリカであり、
前記耐火粒子ｂは、黒曜石、真珠岩及び松脂岩から選ばれる１種以上である請求項１又は２記載の消失模型用塗型剤組成物。 The refractory particles include refractory particles a and refractory particles b,
The refractory particles a are silica,
The vanishing model coating composition according to claim 1 or 2, wherein the refractory particles b are at least one selected from obsidian, nacre, and pine sebite.
前記鋳物用消失模型が、消失模型の表面に請求項１〜５のいずれか１項記載の消失模型用塗型剤組成物を塗布してなる鋳物用消失模型であり、
鋳込み温度が１３９０℃以上である、消失模型鋳造法。 A vanishing model casting method for producing a casting using a vanishing model for casting,
The disappearance model for casting is a disappearance model for casting formed by applying the coating agent composition for disappearance model according to any one of claims 1 to 5 to the surface of the disappearance model,
A vanishing model casting method in which the casting temperature is 1390 ° C. or higher.
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| CN103302238A (en) * | 2013-06-24 | 2013-09-18 | 朱小英 | Preparation method of low-cost high-performance lost foam casting coating |
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